How to install and format MicroSD Card on Chromebook - YouTube
Insert and remove the microSD card for your Samsung Chromebook
Amazon.com: LENTION USB 3.0 Type A to SD/Micro SD Card Reader, SD 3.0 Card Adapter for SD/SDXC/SDHC, Micro SD/Micro SDXC/Micro SDHC Cards Compatible MacBook Pro/Air, Surface, Chromebook, More (CB-H7, Space Gray) :
Insert and remove the microSD card for your Samsung Chromebook
Amazon.com: USB C to Micro SD TF Memory Card Reader, Compatible with iPad Pro, MacBook Pro/Air, Chromebook, 3-in-1 USB Camera Card Reader Adapter for XPS, Galaxy S10/S9 and More USB C Devices :
Best SD Cards to increase your Chromebook storage - Chrome Computing
Whats up with the sd card reader on my 100e chromebook? : r/chromeos